why else statement for function UserExistsToday not work

Question

why else statement for function UserExistsToday not work

I work in c# windows form vs 2015 selecting data from excel
problem i face it
supose i have in excel file
user id dateprint
1001 22/02/2017

if try add this user 1001 again with date 23/02/2017
it must give me message this user found before
but this is not happen and this is actually my problem
my code

bool c = QRC.UserExists(textBox1.Text);

bool b = UserExistsToday();

if (c == true)

{

if (b == true)

{


label8.Text = "User added today";



}


else

{


label8.Text = "User added before";


}
}

}

else

{

label8.Text = "User added first time";


}

my functions

label6 represent datetoday


public bool UserExistsToday()
{
OleDbConnection cn = newOleDbConnection(connection);

string str = $"select * from [Sheet1$] WHERE UserNo='{textBox1.Text}' AND DatePrint = '{label6.Text}'";

OleDbCommand cmd = newOleDbCommand(str, cn);

cn.Open();

var reader = cmd.ExecuteReader();

return reader.HasRows;

}

public bool UserExists(string UserNo)

{

OleDbConnection cn = newOleDbConnection(connection);

string str = "SELECT UserNo FROM [Sheet1$] WHERE UserNo = @UserNo";

OleDbCommand cmd = newOleDbCommand(str, cn);

cmd.Parameters.AddWithValue("@UserNo", UserNo);

cn.Open();

var reader = cmd.ExecuteReader();

return reader.HasRows;
}